1.

The correct order towards bond length is

Answer»

`C-C LT C =C lt C` `-=``C`
`C-=C`` lt C = C lt C -C`
`C= C lt C` `-=` `C lt C -C`
`C = C lt C -C lt C` `-=` `C`

SOLUTION :`UNDERSET"1.20 Å"(C-=C)lt underset"1.34 Å"(C=C)lt underset"1.54 Å"(C-C)`


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